ActiveTcl User Guide

scopedobject objName ?options? None

Name: enterscopecommand:

Command-Line Switch: -enterscopecommand

Specifies a Tcl command to invoke when an object enters scope

(i.e. when it is created..). The default is {}.

Name: enterscopecommand:

Command-Line Switch: -enterscopecommand

Specifies a Tcl command to invoke when an object exits scope

(i.e. when it is deleted..). The default is {}. _________________________________________________________________

The scopedobject command creates a base class for defining Itcl

classes which posses scoped behavior like Tcl variables. The ob- jects are only accessible within the procedure in which they are instantiated and are deleted when the procedure returns. This class was designed to be a general purpose base class for sup- porting scoped incr Tcl classes. The options include the execute a Tcl script command when an object enters and exits its scope.

The scopedobject command creates a new Tcl command whose name is

pathName. This command may be used to invoke various operations on the object. It has the following general form:

pathName option ?arg arg ...?

Option and the args determine the exact behavior of the command.

The following commands are possible for scopedobject objects:

pathName cget option Returns the current value of the configura- tion option given by option. Option may have any of the values accepted by the scopedobject command. pathName configure ?op- tion? ?value option value ...? Query or modify the configuration options of the object. If no option is specified, returns a list describing all of the available options for pathName. If option is specified with no value, then the command returns a list de- scribing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is spec- ified). If one or more option-value pairs are specified, then the command modifies the given objects option(s) to have the giv- en value(s); in this case the command returns an empty string.

Option may have any of the values accepted by the scopedobject

command.

The scopedobject was primarily meant to be a base class. The

following is an example of usage without inheritance:

proc scopedobject_demo {} {

iwidgets::scopedobject #auto

-exitscopecommand {puts enter scopedobject_demo"} -exitscopecommand {puts exit scopedobject_demo"} }

scopedobject_demo

John A. Tucker scopedobject, object

Table of Contents

• Name: enterscopecommand:
• Command-Line Switch: -enterscopecommand
• Specifies a Tcl command to invoke when an object enters scope
• Name: enterscopecommand:
• Command-Line Switch: -enterscopecommand
• Specifies a Tcl command to invoke when an object exits scope
• The scopedobject command creates a base class for defining Itcl
• The scopedobject command creates a new Tcl command whose name is
• Option and the args determine the exact behavior of the command.
• The following commands are possible for scopedobject objects:
• Option may have any of the values accepted by the scopedobject
• The scopedobject was primarily meant to be a base class. The
• John A. Tucker scopedobject, object